Production of lactic acid and byproducts from waste potato starch by <Emphasis Type="Italic">Rhizopus arrhizus</Emphasis>: role of nitrogen sources |
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| Authors: | Z Y Zhang B Jin J M Kelly |
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| Institution: | (1) SA Water Centre for Water Sciences and Systems, University of South Australia, Mawson Lakes, SA, 5095, Australia;(2) Australian Water Quality Center, Bolivar, SA, 5095, Australia;(3) School of Molecular and Biomedical Science, The University of Adelaide, Adelaide, SA, 5005, Australia |
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| Abstract: | Summary Lactic acid was produced by Rhizopus arrhizus using waste potato starch as the substrate. The aim of this study was to identify the role of nitrogen sources and their
impact on the formation of lactic acid and associated byproducts. Ammonium sulphate, ammonium nitrate, urea, yeast extract
and peptone were assessed in conjunction with various ratios of carbon to nitrogen (C:N). Fermentation media with a low C:N
ratio enhanced the production of lactic acid, biomass and ethanol, while a high C:N ratio favoured the production of fumaric
acid. Ammonium nitrate appeared to be the most suitable nitrogen source for achieving a high and stable lactic acid yield,
and minimizing the production of byproducts such as biomass and ethanol, while urea proved to be the least favourable nitrogen
source. Yeast extract and peptone appeared to improve fungal cell growth. The kinetics data revealed that a high concentration
of ammonium nitrate enhanced the lactic acid productivity. The maximum lactic acid concentration of 36.4 g/l, representing
a yield of 91%, was obtained with addition of 0.909 g/l ammonium nitrate in 32 h. |
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| Keywords: | Lactic acid Rhizopus arrhizus Nitrogen sources Waste potato starch Fermentation Byproducts |
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